When you're changing the "start at" number in the chapter numbering dialog, then the number won't be updated in the document until you click on "Format > Clear Direct Formatting" (Control + M) or you assign the same paragraph style to the text again.

In previous versions of LibreOffice, the number was updated automatically after closing the chapter numbering dialog with OK without any further user action.

Steps to reproduce:
1. Open a new Writer document.
2. Insert a short dummy text.
3. Change formatting of this text to paragraph style "Heading 1".
4. Set the cursor into this text.
5. Open Tools > Chapter Numbering...
6. Change "Number" field to what you want, "1, 2, 3, ..." for example.
7. Click OK to close the dialog. The text now has a number in front of it.
8. Open Tools > Chapter Numbering... again.
9. Change the "Start at" field to any other number, "5" for example.
10. Click OK to close the dialog.

Expected result:
The chapter numbering in the document should have changed to "5" as choosen by the user in the dialog.

Actual result:
Nothing. The chapter numbering didn't change and "1" is still visible.


Version: 7.5.2.1 (X86_64) / LibreOffice Community
Build ID: e8bf3b441b8370f8440b0339fd9490765a8d57ca
CPU threads: 12; OS: Windows 10.0 Build 19045; UI render: Skia/Vulkan; VCL: win